Wrench



Dec. 23, 1924. 1,520,170

G, o. c'ARLsoN I WRENCH Filed Nov. 22, 1923 Patented Dec. 23, 1924.

UNKTED STATES 1,520,17t earner ()FHCE.

GUSTAVE O. CARLSON, OF WETHERSFIELD, CONNECTICUT, ASSIGNOR OF ONE-HALF TO HENRY HANSON, OF MIDDLE'IOWN, CONNECTICUT.

WRENCH.

Application filed November 22, 1923.

To all whom it may concern:

Be it known that I, GUsrAvn O. CARLsoN, a citizen of the United States, residing at lVetherslield, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in renches, of which the following is a specification, reference being had therein to the accompanying drawings.

My invention relates to a new and improved wrench, and among other aims and objects thereof maybe recited the provision of a device of the character mentioned, with a view to compactness, in which the number of parts are few, the construction simple, cost of production small, but efliciency and operation high.

The improvements in the details and arrangement of the parts will be apparent from an inspection of the accompanying drawings, in connection with the description hereinafter contained, and wherein a preferred embodiment of the invention is disclosed for the purpose of imparting an understanding of the same.

In the drawing,

Figures 1 and 2 are elevations of my improved wrench;

Figure 3 is a longitudinal sectional view thereof, taken generally upon line 33 of Figure 2;

Figure 4 is thereof, taken Figure 1; and

Figure 5 is thereof, taken Figure 3.

Referring to the drawings, and in connection with which like numerals of reference indicate like parts in the several figures; 10 is the handle which is shown herein as cylindrical in form with a smooth bore 11 for a portion of its length and having internal threads 12 at one end, the diameter of the smooth bore being substantially the same orslightly larger than the diameter at the bottom of the internal threads 12. The collars 13 at each end of the handle are designed to prevent the hand slipping off the handle. \Vhile this structure is not essential, it is desirable. Suitable knurled portions 14 upon the exterior of the handle 10 insure a positive grip of the handle in the hand.

This wrench has two jaws, one held a transverse sectional view generally upon line 4l l of a transverse sectional view generally upon line 55 of Serial No. 676,443.

against endwise movement in relation to the handle and the other having endwise movement. The fixed jaw 15 is provided with a shank portion 16, which is semi-circular in cross section, the diameter of the curved portion being substantially the same as the bore 11 of the handle 10 and having a recess 27 near its outer end to straddle the internal threads 12. Endwise movement of this aw is prevented by a lip 17 at its outer end, which projects over the end of the handle 10 and a lug 18 near the inner end thereof, which also projectsover one end of the handle.

The space between the lip 17 and lug 18 is substantially the same as the length of the handle 10 so that the handle may rotate therebetween.

The lug 18 is preferably integral with the shank 16 but may be separate within the spirit of my invention. i

The movable jaw 19 is provided with a shank 20, also semi-circular. in cross section and provided with external threads 21dupon the curved portion thereof at one en The inner flat faces of the jaws, designated 22 and 23, respectively, are either in contact with each other or separated slightly, substantially as shown in Figures 4; and The extent of this open space is exaggerated in these views for purpose of illustration. Each jaw has a depression 25 in the inner fiat faces thereof to reduce its weight, but this is not essential to the operation of the device.

The head 26 on each of these aws is preferably of less width than the shanks 16 and 20, thus pern'iitting its use in places where space is limited, and the gripping faces 24: thereon are substantially parallel with each other. Smooth face aws may be substituted if desired, or they may be shaped to accommodate varying conditions under which the wrench is to be used. The head of the movable jaw is adjustable toward and away from the head of the fixed jaw by merely rotating the handle 10, the threaded engagement between the jaw and. handle imparting movement thereto, during which operation the fixed jaw is held against endwise movement without preventing rotation of the handle relatively thereto.

This wrench may be adjusted and used with one hand by supporting the handle loosely in the hand while being rotated, and by reason of the narrow heads 26 the jaws will lie flat relatively to the object to be gripped. If there is a slight space between the flat faces of the jaws substantially as shown in the drawings, when lateral pressure is applied to the handle, the teeth upon the gripping faces of each of the jaws secure a powerful bite or grip when lateral pressure is applied to the handle that is especial- 1y advantageous if the wrench is used for rotating objects with a rounded surface. No relative adjustment of the aws is obtainable when lateral pressure is applied to the handle, as the friction of the movable jaw upon. the inside wall of. the handle is too great at this time. Hence, there is no possi bility of a movement of the jaws when under labor that will cause them to slip.

Minor changes and alterations may be made within my invention, aside from those herein: suggested, and I would therefore have it: understood that I do not limit myself to the exact construction herein shown and described, but claim all that falls fairly within the spirit and scope of the appended claims.

Having described my invention, what I claim as new and desire to secure by Letters Patent, is:

1-. In a wrench, the combination with two jaws, and a handle which is rotatable about both of said jaws, the heads of both of said jaws projecting laterally from the shank, the head on one jaw projecting over and away from the rounded side of the shank thereof and away from the rounded side of the shank of the other jaw, neither of the jaws having an intermeshing engagement with each other.

2. In a wrench, the combination with two jaws and a handle which is rotatable about both of said jaws, one of said jaws having a lip at one end that projects over one end of the handle and a lug substantially parallel therewith that projects over the opposite end of said handle and the other of said jaws having engagement with said handle whereby rotation thereof imparts movement thereto substantially parallel with the axis of the handle, neither of the jaws having an intermeshing engagement with each other.

3. In a wrench; a cylindrical handle interiorly threaded at one end and provided with roughened exterior surfaces, whereby the same may be grasped and rotated manually; a jaw projecting through said handle and having spaced lips thereon that project over the ends of the handle and prevent relative endwise movement of the jaw therein; a second jaw having a thread upon a portion of its shank which engages a thread within the handle and by reason thereof imparts movement thereto parallel with the first jaw, said jaws when assembled with the handle having no intermesliing engagement with each other and each of said aws having a longitudinal depression in the face thereof next adj aeent to the face of the other jaw.

In testimony whereof, I have hereunto aiiixed my signature.

GUSTAVE O. CARLSON. 

